No questions found
Which process occurs both in plants and in animals?
556
542
545
What does the term *species* mean?
517
502
599
Woodlice are arthropods with 14 jointed legs.
To which arthropod class do they belong?
559
521
599
Sunflowers have yellow flowers.
Which cell structure is found in sunflower leaves but not in the petals of the flowers?
589
581
510
The diagram shows part of a leaf in cross-section.
Structures X and Y are both part of the same
527
519
508
A bacterial cell has a length of 40 mm when it is magnified by \( \times 20\ 000 \).
What is the actual length of the bacterial cell?
572
582
584
How do carbon dioxide and oxygen move into and out of a mesophyll cell?
579
566
573
The diagram shows four identical pieces of potato in test-tubes. The potato pieces were left as shown for six hours.
Which piece of potato would have the greatest increase in mass?
549
507
574
The data show the concentrations of sugar and starch in an onion.
[Table_1]
The onion is tested with Benedict's solution and iodine solution.
Which set of results is correct?
594
574
510
The apparatus shown is used for an experiment on starch digestion.
Which test-tube contains the most sugar after 20 minutes?
596
514
565
An experiment was carried out using the apparatus shown.
The carbon dioxide content of the water in each test-tube was measured at the start and again three hours later.
In which test-tube would there be a decrease in carbon dioxide content?
588
509
562
The diagram shows a cross-section of a leaf.
Which row shows the correct labels?
588
585
553
The diagram shows the activity of salivary amylase, pancreatic lipase and stomach protease at different pH levels.
From the graph, what is the optimum pH for the protease enzyme?
581
519
500
The diagram shows a section through the stem of a dicotyledonous plant. Which part transports water and mineral ions?
553
579
518
The diagram shows two shoots at the start of an experiment on transpiration.
What are the likely readings on the spring balances after three days?
505
582
564
The diagram shows a circulatory system.
Which vessels carry oxygenated blood?
585
526
582
The body's first line of defence can prevent some pathogens from entering the body.
Which is a first line of defence?
510
534
527
The graph shows changes in the volume of air in the lungs of a person at rest, over a period of 30 seconds.
Which graph shows changes in the volume of air in the lungs of the same person immediately after they have done five minutes of vigorous exercise?
595
538
503
Glucose is required for respiration.
Which other molecule is required for aerobic respiration?
538
523
506
Which row correctly shows the organ where each substance is excreted? [Table_1]
509
539
556
The diagram shows a reflex arc.
Which label points to the sensory neurone?
586
571
559
The diagram shows the appearance of the iris and pupil in three different light conditions.
Which row shows the size of the pupil of the eye in each light condition?
[Table_1]
564
591
522
Some possible effects of injecting substances are listed.
1. It can cause addiction.
2. It can provide immunity to a disease.
3. It can cause HIV infection if needles are shared.
4. It can improve reaction times.
Which effects are associated with injecting heroin?
535
511
504
When asexual reproduction takes place, there will always be
568
505
593
The diagram shows the female reproductive system. Where does implantation normally occur?
587
546
507
Which precautions could help to prevent the spread of AIDS?
1 avoiding the mixing of blood
2 using a femidom
3 using the contraceptive pill
4 using a condom
506
523
514
The diagram shows a timeline of a woman's menstrual cycle, which lasts for 28 days.
On which days of the menstrual cycle is a woman most likely to become pregnant?
587
543
598
Which name is given to different versions of a gene?
531
504
529
Which cells in the human body are produced by meiosis?
585
598
590
Two pea plants with white flowers are crossed. Some of the offspring pea plants have red flowers and some have white flowers.
Which statement about the parent pea plants is correct?
579
565
579
The diagram shows a plant reproducing asexually by growing a plantlet from a runner. The leaves of the plantlet appear different to the leaves of the parent plant.
Which statement explains the difference in the leaf shape of the plantlet?
586
521
519
The diagram shows a plant reproducing asexually by growing a plantlet from a runner. The leaves of the plantlet appear different to the leaves of the parent plant.
Which statement explains the difference in the leaf shape of the plantlet?
503
503
522
Which organism in the food chain shown uses light energy? [Image_1: Food chain - A: green plant, B: chicken, C: rat, D: cobra]
591
570
586
What is the definition of a food chain?
588
598
514
Elk are mammals and they are herbivores. The graph shows the total number of elk in a national park between 1978 and 2008.
What is a possible explanation for the change in the elk population between 1998 and 2000?
531
569
519
Bacteria have the following features.
1. the ability to make complex molecules
2. the ability to reproduce quickly
3. have a cell membrane
4. have cytoplasm
Which features make bacteria useful in biotechnology?
578
565
548
Some washing powders contain enzymes as well as detergent. In an experiment, three pieces of cloth were stained with the same substance. They were left in different beakers of detergent, some with added enzyme, at 40°C for 30 minutes.
Which statement is correct for the results shown by this experiment?
507
524
533
Which activity is the least likely source of pollution?
600
541
555
What is used in the conservation of species?
534
520
506
